Extraction of Aluminium
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In the commercial electrochemical process for Aluminium extraction, the electrolyte used is:
Al(OH)3 in NaOH
An aqueous solution of Al2(SO4)3
A molten mixture of Al2O3 & Na3AlF6
A molten mixture of Al2O3 & Al(OH)3
- Hg
- Cu
- Al
- Zn
Complete the following
2Al2O3+3C→4A+3B. A & B are as follows.
CO, Al
Al, CO
Al, CO2
CO2, Al
The bauxite ore of aluminium is concentrated by froth flotation
False
True
During the electrolytic extraction of Aluminium, purified alumina is mixed with Na3 AlF6 and CaF2. Why?
They increase the conductivity
They increase the Melting point of the mix
They decrease the conductivity
They decrease the Melting Point of the mix
- tin from SnO2
- iron from Fe2O3
- aluminium from Al2O3
- magnesium from CaCO3.MgCO3
Complete the following
2Al2O3+3C→4A+3B. A & B are as follows.
Al, CO2
CO2, Al
Al, CO
CO, Al
In the commercial electrochemical process for Aluminium extraction, the electrolyte used is:
Al(OH)3 in NaOH
A molten mixture of Al2O3 & Na3AlF6
A molten mixture of Al2O3 & Al(OH)3
An aqueous solution of Al2(SO4)3
- CO and CO2 are produced in this process
Al2O3 is mixed with CaF2, which lowers the melting point of the mixture and brings conductivity
Al3+ is reduced at the cathode to form Al
Na3AlF6 serves as the electrolyte
Electrolytic reduction of alumina to aluminium by Hall-Heroult process is carried out:
in the presence of NaCl
in the presence of fluorite
in the presence of cryolite which forms a melt with a lower melting temperature
in the presence of cryolite which forms a melt with a higher melting temperature